What does an atomic number tell us about an atom? 1. The number of neutrons it has
2. The number of protons it has
3. The number of electrons it has
4. None and above

Explanation:

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2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.